永远居中的层-(不管怎么拉动滚动条)最新完美CSS版(转)-优快云博客

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>无标题文档</title>
<style type="text/css">
<!--
.mydiv {
background-color: #FFCC66;
border: 1px solid #f00;
text-align: center;
line-height: 50px;
font-size: 12px;
font-weight: bold;
width: 300px;
height: 100px;
left:50%;/*FF IE7*/
top:50%;/*FF IE7*/

margin-left:-150px!important;/*FF IE7 该值为本身宽的一半 */
margin-top:-50px!important;/*FF IE7 该值为本身高的一半*/
margin-left:0px;
margin-top:0px;

position:fixed!important;/*FF IE7*/
position:absolute;/*IE6*/

_top:       expression(eval(document.compatMode &&
            document.compatMode=='CSS1Compat') ?
            documentElement.scrollTop + (document.documentElement.clientHeight-this.offsetHeight)/2 :/*IE6*/
            document.body.scrollTop + (document.body.clientHeight - this.clientHeight)/2);/*IE5 IE5.5*/
_left:      expression(eval(document.compatMode &&
            document.compatMode=='CSS1Compat') ?
            documentElement.scrollLeft + (document.documentElement.clientWidth-this.offsetWidth)/2 :/*IE6*/
            document.body.scrollLeft + (document.body.clientWidth - this.clientWidth)/2);/*IE5 IE5.5*/

}

-->
</style>
</head>
<body>
<div class="mydiv">网页设计大本营欢迎你！<br/>Q群号:26868887</div>
<div style="width: 1500px; height: 1500px;"></div>
</body>
</html>